Pentagon station is a split platform station on the Washington Metro located adjacent to The Pentagon in Arlington, Virginia. The station was opened on July 1, 1977, and is operated by the Washington Metropolitan Area Transit Authority. Providing service for both the Blue and Yellow Lines, the station is where the two lines diverge and thus acts as a transfer point. Northbound, both lines rise above ground, with the Blue Line serving the Arlington Cemetery station, and the Yellow Line crossing the Potomac River into the District of Columbia.
Pentagon station platform
A split platform or separate platform is a station that has a platform for each track, split onto two or more levels. This configuration allows a narrower station plan horizontally, at the expense of a deeper vertical elevation, because sets of tracks and platforms are stacked above each other. Where two rail lines cross or run parallel for a time, split platforms are sometimes used in a hybrid arrangement that allows for convenient cross-platform interchange between trains running in the same general direction.
A pair of split level platforms in Harvard station of the Boston-Cambridge MBTA Red Line service. The upper (outbound) platform at left is empty, while the lower (inbound) platform is relatively crowded.